Dev
Dummy SQL Schema Generator
Writing CREATE TABLE boilerplate from scratch is slow and dialect-specific — column types, NOT NULL constraints, defaults, and indexes all differ between PostgreSQL, MySQL, and SQLite. A dummy SQL schema generator handles all dialect differences automatically. The `tableType` input selects the table: users, products, orders, blog_posts, or transactions. Each schema includes realistic columns — users get uuid, password_hash, role, is_active, and is_verified; transactions get payment_method, gateway_reference, failure_reason, and a JSONB/TEXT metadata column. The `dialect` input applies correct syntax: PostgreSQL uses SERIAL, BOOLEAN, and TIMESTAMP WITH TIME ZONE; MySQL uses AUTO_INCREMENT and TINYINT(1); SQLite uses INTEGER PRIMARY KEY with type affinities. Every schema includes CREATE INDEX statements for commonly queried columns.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Select your Table Type from the dropdown — choose the table that best matches your use case, such as users, products, or orders.
- Select your SQL Dialect — pick PostgreSQL, MySQL, or SQLite to match the database you are working with.
- Click Generate to produce a complete CREATE TABLE statement with columns, constraints, and indexes.
- Copy the generated SQL using the copy button, then paste it into your database client, CLI, or migration file.
- Modify column names, data types, or constraints as needed before committing the schema to your project.
Use Cases
- •Running prisma db pull against a generated PostgreSQL users schema to auto-scaffold a schema.prisma file
- •Seeding a local MySQL orders table with foreign key constraints to test payment processing logic in Postman
- •Applying a SQLite transactions schema in DB Browser for SQLite to prototype an offline-capable mobile app
- •Pasting a blog_posts CREATE TABLE into a Django or Laravel raw SQL migration to skip writing boilerplate
- •Testing Sequelize or TypeORM model mappings against a realistic products schema with price and stock columns
Tips
- →Generate the users table first when building a multi-table app — other tables like orders and transactions reference it via foreign keys.
- →If you plan to use Prisma, apply the SQL schema first, then run prisma db pull to auto-generate your models without manual schema writing.
- →For SQLite in a mobile or local-first app, the generated schema works as-is inside a React Native SQLite plugin or Electron app with better-sqlite3.
- →The generated indexes cover single-column lookups. Add composite indexes manually for queries that filter on two columns simultaneously, like status AND created_at.
- →When teaching SQL, use the MySQL dialect for beginners — its syntax is more widely documented in tutorials and beginner courses than PostgreSQL.
- →Copy the schema into a seed script alongside your INSERT statements so teammates can spin up a matching local database in one command.
FAQ
can I use the generated schema as a starting point for a production database
Yes. The schemas include proper constraints, indexes on commonly queried columns, and dialect-correct defaults that hold up in production. You'll want to rename columns to match your domain, adjust VARCHAR lengths to your actual data maximums, add foreign key constraints between tables, and potentially widen integer types to BIGSERIAL or BIGINT before running a final migration.
what are the main differences between the postgresql and mysql output
PostgreSQL schemas use SERIAL for auto-increment, UUID with gen_random_uuid() for UUIDs, BOOLEAN for flags, JSONB for the metadata column, and TIMESTAMP WITH TIME ZONE. MySQL uses INT AUTO_INCREMENT, VARCHAR(36) for UUIDs, TINYINT(1) for booleans, and DATETIME. The generator applies all of these substitutions automatically when you switch dialects.
does the sqlite output handle auto-increment the same way as postgresql
SQLite uses INTEGER PRIMARY KEY, which aliases the built-in rowid and provides auto-increment behavior without the AUTOINCREMENT keyword. The output sticks to SQLite type affinities — INTEGER, TEXT, REAL — and omits PostgreSQL- and MySQL-specific syntax that SQLite 3 would reject. The behavior is equivalent for most use cases, though SQLite's rowid reuse policy differs from SERIAL in edge cases.
which table should I generate first when building a multi-table application
Start with users, since the orders and transactions tables reference user_id as a foreign key. Generate users first, apply the schema, then generate orders or transactions and add the REFERENCES users(id) constraint manually before running the second migration. The generator doesn't produce cross-table foreign key constraints — those need to be added by hand based on your specific schema relationships.
You might also like
Popular tools from other categories that share themes with this one.
Try these next
More free tools from other corners of the catalog, picked by shared themes.